I am very new with android and doing this first time. I am trying to download pdf form url in my app but its not getting downloaded. I really got messed up with this. I don't what i am missing ,why this is not working for me. Please help me to do this.
Here i am pasting my code:
public class ProductBrochureActivity extends Activity {
private static String cookie;
private static String nid;
WebView webViewForBrochureAndVideo;
private String prodBrochureURL;
private String prodVideoURL;
private static int clickedItemId;
ActionBar actionBar;
private static HashMap<String, String> cookieWithRequest = new HashMap<String, String>();
static Object json;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.product_brochure);
actionBar = getActionBar();
actionBar.hide();
Intent intent = getIntent();
cookie = intent.getStringExtra(BsharpConstant.WEB_SERVICES_COOKIES);
nid = intent.getStringExtra(BsharpConstant.PRODUCT_NODE_ID);
clickedItemId = intent.getIntExtra(BsharpConstant.CLICKED_ITEM_ID, 0);
String jsonResponseFromWebservices = WebserviceBsharpUtil
.callWebServicesToGetTheProductBrochureAndVideo(cookie, nid);
urlFromResponse(jsonResponseFromWebservices);
cookieWithRequest.put(BsharpConstant.WEB_SERVICES_COOKIES, cookie);
switch (clickedItemId) {
case 0:
if (!prodBrochureURL.isEmpty()) {
try {
new DownloadFile();
} catch (ActivityNotFoundException e) {
Toast.makeText(this,
"No Application Available to View PDF",
Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(this, "No PDF is Attached with this Product",
Toast.LENGTH_SHORT).show();
}
break;
case 1:
if (!prodVideoURL.isEmpty()) {
try {
new DownloadFile();
} catch (ActivityNotFoundException e) {
Toast.makeText(this,
"No Application Available to View PDF",
Toast.LENGTH_SHORT).show();
}
break;
} else {
Toast.makeText(this, "No Video is Attached with this Product",
Toast.LENGTH_SHORT).show();
}
}
}
/**
* GetTheBrochureAndAttachedVideoURL
*
* #param jsonResponse
*/
public void urlFromResponse(String jsonResponse) {
try {
json = new JSONTokener(jsonResponse).nextValue();
if (json instanceof JSONArray) {
JSONArray jsonArray = (JSONArray) json;
prodBrochureURL = jsonArray.getJSONObject(0).getString(
BsharpConstant.PRODUCT_BROCHURE_URL);
prodVideoURL = jsonArray.getJSONObject(0).getString(
BsharpConstant.PRODUCT_VIDEO_URL);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
private class DownloadFile extends AsyncTask<Void, Void, String> {
#Override
protected String doInBackground(Void... params) {
String filename = "brochure.pdf";
HttpURLConnection connection;
try {
URL url = new URL(prodBrochureURL);
connection = (HttpURLConnection) url.openConnection();
connection.addRequestProperty(
BsharpConstant.WEB_SERVICES_COOKIES, cookie);
connection.setDoOutput(true);
connection.connect();
} catch (IOException e1) {
return e1.getMessage();
}
File folderDir = new File(getExternalFilesDir("Bsharp_PDF")
+ "/Download");
File file = new File(folderDir, filename);
if (file.exists()) {
file.delete();
}
if ((folderDir.mkdirs() || folderDir.isDirectory())) {
try {
InputStream inputStream = connection.getInputStream();
FileOutputStream fileOutputStream = new FileOutputStream(
folderDir + "/" + filename);
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = inputStream.read(buffer)) != -1) {
fileOutputStream.write(buffer, 0, len1);
}
fileOutputStream.close();
inputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(),
"Unable to create folder", Toast.LENGTH_LONG).show();
}
return "Done";
}
#Override
protected void onPostExecute(String result) {
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG)
.show();
super.onPostExecute(result);
}
}
}
In order for an AsyncTask (DownloadFile in your case) to be executed one has to explicitly call its execute(Params... params) method. In your case in addition to instantiating your task call execute without providing any parameters, i.e.
DownloadFile task = new DownloadFile();
task.execute();
Hope this helps.
Related
I want to parse JSON from the Openweather API but after many iterations and debugging, my JSON string is not updating, I do not think that there is any problem still the temperatures( minTemperature and maxTemperature) and the name of the place(mPlace) is not set, also I logged the maxtemperature but the console is showing nothing please look into my code.
public class MainActivity extends AppCompatActivity {
private EditText placeText;
private Button enterPlaceButton;
private TextView minTemperature;
private TextView maxTemperature;
private TextView mPlace;
private static final String AppID ="56a5e01eba3af36a7a9b7b210a437d09";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle("Weather");
placeText = findViewById(R.id.myPlaceEditText);
enterPlaceButton = findViewById(R.id.enterPlace);
minTemperature = findViewById(R.id.minTemperature);
maxTemperature = findViewById(R.id.maxTemperature);
mPlace = findViewById(R.id.mPlace);
}
#Override
protected void onResume() {
final URL[] url = {null};
enterPlaceButton.setOnClickListener(v -> {
url[0] = makeUrl(placeText.getText().toString());
placeText.setText("");
});
if (url[0] != null) {
MyAsync myAsync = new MyAsync();
myAsync.execute(url[0]);
}
super.onResume();
}
public URL makeUrl(String place) {
Uri.Builder uriBuilder = new Uri.Builder();
uriBuilder.scheme("http");
uriBuilder.authority("api.openweathermap.org/");
uriBuilder.appendPath("data");
uriBuilder.appendPath("2.5");
uriBuilder.appendPath("weather");
uriBuilder.appendQueryParameter("q",place);
uriBuilder.appendQueryParameter("appid",AppID);
try {
return new URL(uriBuilder.build().toString());
} catch (MalformedURLException e) {
Toast.makeText(MainActivity.this, "Sorry could not able to fetch the Data", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
return null;
}
public class MyAsync extends AsyncTask<URL, Void, String> {
#Override
protected String doInBackground(URL... urls) {
StringBuilder jsonResponseBuilder = new StringBuilder();
try {
HttpURLConnection httpURLConnection = (HttpURLConnection) urls[0].openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setReadTimeout(10000);
httpURLConnection.setConnectTimeout(15000);
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.connect();
if (httpURLConnection.getResponseCode() == 200) {
InputStreamReader inputStreamReader = new InputStreamReader(httpURLConnection.getInputStream());
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String line = bufferedReader.readLine();
while (line != null) {
jsonResponseBuilder.append(line);
line = bufferedReader.readLine();
}
httpURLConnection.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Sorry could not able to fetch the Data", Toast.LENGTH_SHORT).show();
}
Log.d(MyAsync.class.getName(),jsonResponseBuilder.toString());
return jsonResponseBuilder.toString();
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onPostExecute(String s) {
setDataFromJSON(s);
super.onPostExecute(s);
}
public void setDataFromJSON(String s) {
try {
JSONObject jsonObject = new JSONObject(s);
JSONObject getMainObject = jsonObject.getJSONObject("main");
String maxTemp = getMainObject.getString("temp_max");
Log.i(MainActivity.class.getName(), maxTemp);
maxTemperature.setText(maxTemp);
String minTemp = getMainObject.getString("temp_min");
minTemperature.setText(minTemp);
mPlace.setText(jsonObject.getString("name"));
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Sorry could not able to fetch the Data", Toast.LENGTH_SHORT).show();
}
}
}
}
I want to get the username from this
Json url.
I have this code but it doesn't let me get the data saying
Json parsing error
Here is the code:
HttpHandler.java
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
private String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "https://someLink";
ArrayList<HashMap<String, String>> contactList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.list);
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String name = c.getString("username");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("username", name);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, contactList,
R.layout.list_item, new String[]{"username"}, new int[]{R.id.name});
lv.setAdapter(adapter);
}
}
}
This is an example i found on google and tried to change it a bit in my needs.I've put an empty JsonArray.I also tried other examples but i can't understand what is going wrong.
**
> New question
If my url is like this?What is the difference with the other?
**
You don't have an array to parse in the output. Your URL giving you an Object. Your code should be something like this
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String name = jsonObj.getString("username");
//... now use the whereever you want
}
catch (final JSONException e) {
//... put your error log
}
Please edit your code in MainActivity to get the username from json string as follows :
if(jsonStr!=null)
{
JSONObject jsonObj = new JSONObject(jsonStr);
if(jsonObj !=null)
{
String name = jsonObj .getString("username");
}
}
i suggest you to use this one.
public class HttpGetResources extends AsyncTask<String, Void, Object> {
#SuppressLint("StaticFieldLeak")
private ProgressBar progressBar;
private static final String RAW_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSz";
private String urlString;
private String apiName;
private Class Response_Class;
private static final Gson GSON = new GsonBuilder().setDateFormat(RAW_DATE_FORMAT).create();
private Context context;
public HttpGetResources(Context context,Class Response_Class, String apiName, String urlString) {
this.Response_Class = Response_Class;
this.apiName = apiName;
this.urlString = urlString;
this.context=context;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onPostExecute(Object response) {
super.onPostExecute(response);
}
HttpURLConnection conn = null;
OutputStreamWriter out = null;
Object result = null;
BufferedReader buffer = null;
final ExecutorService executor = Executors.newCachedThreadPool(Executors.defaultThreadFactory());
static public Future<Object> future;
#SuppressWarnings("unchecked")
#Override
protected Object doInBackground(final String... params) {
// JsonObject res=null;
future = executor.submit(new Callable<Object>() {
#Override
public Object call() throws IOException {
try {
URL url = new URL(urlString + apiName);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
conn.setConnectTimeout(3000);
conn.setReadTimeout(15000);
conn.setDoInput(true);
conn.setDoOutput(true);
out = new OutputStreamWriter(conn.getOutputStream());
out.write(params[0]);
out.flush();
out.close(); out=null;
buffer = new BufferedReader(new InputStreamReader(conn.getInputStream()));
// res= GSON.fromJson(buffer, JsonObject.class);
// result = new Gson().fromJson(res.toString(), Response_Class);
result = GSON.fromJson(buffer, Response_Class);
buffer.close(); buffer=null;
// result = new Gson().fromJson(res.toString(), Response_Class);
} catch (Exception e) {
//
} finally {
if (buffer!=null) {
try {
buffer.close();
} catch (Exception e) { //
}
}
if (out != null) {
try {
out.close();
} catch (Exception e) { //
}
}
if (conn != null) {
conn.disconnect();
}
}
return result;
}
});
try {
result = future.get(10, TimeUnit.SECONDS);
} catch (Exception ignored) {
}
return result;
}
}
--and call method--
public synchronized Object HttpGetRes(final Object REQUEST_CLASS, final Class RESPONSE_CLASS, final String
API_NAME, final String URL) {
if(isNetworkAvailable()) {
response = null;
try {
Log.e(API_NAME, "url: " + URL);
Log.e(REQUEST_CLASS.getClass().getSimpleName(), new Gson().toJson(REQUEST_CLASS));
HttpGetResources resource = new HttpGetResources(BaseContext,RESPONSE_CLASS, API_NAME,
URL);
response = resource.execute(new Gson().toJson(REQUEST_CLASS)).get();
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
if (response != null) {
String x = new Gson().toJson(response);
Log.e(RESPONSE_CLASS.getSimpleName(), x);
return response;
} else {
}
}
return null;
}
Try to use GSON library in the future, it will auto convert the JSON object to a java object automatically for you. This will be useful to avoid parsing complex JSON objects or JSON arrays. https://github.com/google/gson
I got an api token for my api but don't know how to implement it in my code...
this is the code i have for reaching my api:
public class DataVoetbalWebservice extends AsyncTask<VoetbalDataInterface, Void, JSONArray> {
private static final int CONNECTION_TIMEOUT = 12000;
private static final int DATARETRIEVAL_TIMEOUT = 12000;
VoetbalDataInterface listener;
private ProgressDialog dialog;
Context context;
public void setActivity(Context context) {
this.context = context;
dialog = new ProgressDialog(context);
}
#Override
protected void onPreExecute() {
dialog.setMessage("De Verschillende competities ophalen, even geduld aub.");
dialog.show();
}
#Override
protected JSONArray doInBackground(VoetbalDataInterface... params) {
listener = params[0];
// execute search
disableConnectionReuseIfNecessary();
HttpURLConnection urlConnection = null;
try {
// create connection
//URL urlToRequest = new URL("http://datatank.stad.gent/4/bevolking/geboortes.json?%2Fbevolking%2Fgeboortes=");
URL urlToRequest = new URL("http://api.football-data.org/v1/competitions");
urlConnection = (HttpURLConnection)
urlToRequest.openConnection();
urlConnection.setConnectTimeout(CONNECTION_TIMEOUT);
urlConnection.setReadTimeout(DATARETRIEVAL_TIMEOUT);
// handle issues
int statusCode = urlConnection.getResponseCode();
if (statusCode == HttpURLConnection.HTTP_UNAUTHORIZED) {
} else if (statusCode != HttpURLConnection.HTTP_OK) {
// handle any other errors, like 404, 500,..
}
// create JSON object from content
InputStream in = new BufferedInputStream(
urlConnection.getInputStream());
return new JSONArray(getResponseText(in));
} catch (MalformedURLException e) {
// URL is invalid
Log.d("Info", e.getMessage());
} catch (SocketTimeoutException e) {
// data retrieval or connection timed out
Log.d("Info", e.getMessage());
} catch (IOException e) {
// could not read response body
// (could not create input stream)
Log.d("Info", e.getMessage());
} catch (JSONException e) {
// response body is no valid JSON string
Log.d("Info", e.getMessage());
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
}
return null;
}
#Override
protected void onPostExecute(JSONArray json) {
if (dialog.isShowing()) {
dialog.dismiss();
}
ArrayList <Competitie> competities = new ArrayList<>();
try {
for (int i = 0; i < json.length(); i++) {
Competitie competitie = new Competitie();
JSONObject jsonObject = json.getJSONObject(i);
competitie.setId(jsonObject.getInt("id"));
competitie.setCaption(jsonObject.getString("caption"));
competitie.setLeague(jsonObject.getString("league"));
competitie.setYear(jsonObject.getString("year"));
competitie.setCurrentMatchday(jsonObject.getInt("currentMatchday"));
competitie.setNumberOfMatchdays(jsonObject.getInt("numberOfMatchdays"));
competitie.setNumberOfTeams(jsonObject.getInt("numberOfTeams"));
competitie.setNumberOfGames(jsonObject.getInt("numberOfGames"));
JSONObject links = jsonObject.getJSONObject("_links");
JSONObject teams = links.getJSONObject("teams");
JSONObject stand = links.getJSONObject("leagueTable");
competitie.setTeamString(teams.getString("href"));
competitie.setStandUrl(stand.getString("href"));
competities.add(competitie);
}
} catch (JSONException e) {
e.printStackTrace();
}
listener.updateScreenCompetities(competities);
}
/**
* required in order to prevent issues in earlier Android version.
*/
private static void disableConnectionReuseIfNecessary() {
// see HttpURLConnection API doc
if (Integer.parseInt(Build.VERSION.SDK)
< Build.VERSION_CODES.FROYO) {
System.setProperty("http.keepAlive", "false");
}
}
private static String getResponseText(InputStream inStream) {
// very nice trick from
// http://weblogs.java.net/blog/pat/archive/2004/10/stupid_scanner_1.html
return new Scanner(inStream).useDelimiter("\\A").next();
}
}
where do i add the token so i can contact the api?..
because for know i can't read anymore data because the request capacity is full. i already got my api token emailed to me.
This is the documentation for the api, how do i add the request header?
Documentation about token use
thanks in advance
EDIT
added this line of code and now it works!
urlConnection.setRequestProperty("X-Auth-Token","6a0c52afadac44f5bc65bd0dcfb363c2");
I am getting my content from json through server.I have two TextView and one ImageView in my layout.i have written the content from json to a file. but i not able to set my data while offline
I am getting the data from a file also.
MainActivity.java:
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private Context context;
private NavigationView mNavigationView;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
NewsAdapter adapter;
ArrayList<News> Newslist;
private Toolbar mToolbar;
private ProgressDialog pDialog;
private String TAG = MainActivity.class.getSimpleName();
private static String url = "https://www.amrita.edu/amrita_api/v1/news_android.jsonp";
String image;
String imageurl;
ArrayList<HashMap<String, String>> arraylist;
// ArrayList<String> newsList = new ArrayList<String>();
WebView descWView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_json);
Newslist = new ArrayList<News>();
context=getApplicationContext();
//initViews();
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle(R.string.title);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setIcon(R.drawable.app_icon);
initViews();
initContentWebView();
setUpNavDrawer();
new GetContacts().execute();
}
private void initViews(){
mNavigationView = (NavigationView) findViewById(R.id.navigation_view);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
}
void initContentWebView(){
String htmlText = " %s ";
// ArrayList<String> myData = newsList;
// descWView = (WebView) findViewById(R.id.content_wview);
// String htmlData= "<html><body style='text-align:justify;font-size:"+getResources().getInteger(R.integer.main_text)+"px'><p>'sajhdsakjc;osalcjklsx'</p>"+myData.toString()+"</body></Html >";
//descWView.getSettings().setDefaultTextEncodingName("utf-8");
// descWView.loadData(htmlData, "text/html", "utf-8");
// descWView.loadDataWithBaseURL(String.format(htmlText, htmlData), String.valueOf(myData), "text/html", "UTF-8", String.format(htmlText, htmlData));
// descWView.s(myData);
}
private void setUpNavDrawer() {
mDrawerToggle=new ActionBarDrawerToggle(this,mDrawerLayout,mToolbar,R.string.drawer_open,R.string.drawer_close);
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
mNavigationView.setNavigationItemSelectedListener(this);
}
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
String item=menuItem.getTitle().toString();
String dPath=menuItem.getTitleCondensed().toString();
if(item.equals("News")){
//this.finish();
mDrawerLayout.closeDrawers();
Intent intent = new Intent(context, MainActivity.class);
startActivity(intent);
this.finish();
//Toast.makeText(getApplicationContext(), "god", Toast.LENGTH_SHORT).show();
}
else if(item.equals("Events")){
mDrawerLayout.closeDrawers();
Intent intent = new Intent(context, EventActivity.class);
startActivity(intent);
this.finish();
Toast.makeText(getApplicationContext(), "god1", Toast.LENGTH_SHORT).show();
}
else if(item.equals("Latest Publications")){
mDrawerLayout.closeDrawers();
Toast.makeText(getApplicationContext(), "god2", Toast.LENGTH_SHORT).show();
} else if(item.equals("Students Achivements")){
mDrawerLayout.closeDrawers();
Toast.makeText(getApplicationContext(), "god3", Toast.LENGTH_SHORT).show();
}
else if(item.equals("Important Announcements")){
mDrawerLayout.closeDrawers();
Toast.makeText(getApplicationContext(), "god4", Toast.LENGTH_SHORT).show();
}
else if(item.equals("Research")){
mDrawerLayout.closeDrawers();
Intent intent = new Intent(context, ResearchActivity.class);
startActivity(intent);
this.finish();
//Toast.makeText(getApplicationContext(), "god5", Toast.LENGTH_SHORT).show();
}
else if(item.equals("Ranking")){
mDrawerLayout.closeDrawers();
//Toast.makeText(getApplicationContext(), "god6", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, RankingActivity.class);
startActivity(intent);
this.finish();
}
else if(item.equals("International")){
mDrawerLayout.closeDrawers();
//Toast.makeText(getApplicationContext(), "god7", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, InternationalActivity.class);
startActivity(intent);
this.finish();
}
else if(item.equals("About")){
mDrawerLayout.closeDrawers();
Intent intent = new Intent(context, AboutActivity.class);
startActivity(intent);
this.finish();
// Toast.makeText(getApplicationContext(), "god8", Toast.LENGTH_SHORT).show();
}
else if(item.equals("Contact Us")) {
mDrawerLayout.closeDrawers();
// Toast.makeText(getApplicationContext(), "god9", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, ContactUs.class);
intent.putExtra("keyId", item);
intent.putExtra("descPath",dPath);
startActivity(intent);
// this.finish();
}
return true;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_share) {
/*Intent intent=new Intent(context,AboutActivity.class);
startActivity(intent);
return true;*/ Toast.makeText(getApplicationContext(), "msg msg", Toast.LENGTH_SHORT).show();
}
return super.onOptionsItemSelected(item);
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// arraylist = new ArrayList<HashMap<String, String>>();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
JSONArray jsonarray = null;
try {
jsonarray = new JSONArray(jsonStr);
for (int i = 0; i <jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
News news = new News();
JSONObject jsonobject = jsonarray.getJSONObject(i);
JSONObject jsonimage=jsonobject.getJSONObject("image");
//Log.d(String.valueOf(jsonimage), String.valueOf(jsonimage.length()));
String imageurl=jsonimage.getString("filename");
// System.out.println(imageurl);
// Retrive JSON Objects
news.setTitle(jsonobject.getString("title"));
news.setBody(jsonobject.getString("body"));
// news.setImage(jsonobject.getString("image"));
news.setImage(jsonimage.getString("filename"));
// Set the JSON Objects into the array
Newslist.add(news);
/*image = jsonobject.getString("image");
String title = jsonobject.getString("title");
String content = jsonobject.getString("content");
newsList.add(image);
newsList.add(title);
newsList.add(content);*/
// Log.d(newsList.get(i),"image");
// Log.d(title,"title");
// System.out.println("All MinQuantitiy"+newsList);
}
} catch (JSONException e) {
e.printStackTrace();
}
/* try {
JSONObject jsonObj = new JSONObject(jsonStr);
Log.d(jsonStr,"json");
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("news");
// looping through All Contacts
*//*for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString("id");
String name = c.getString("name");
String email = c.getString("email");
String address = c.getString("address");
String gender = c.getString("gender");
// Phone node is JSON Object
JSONObject phone = c.getJSONObject("phone");
String mobile = phone.getString("mobile");
String home = phone.getString("home");
String office = phone.getString("office");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("name", name);
contact.put("email", email);
contact.put("mobile", mobile);
// adding contact to contact list
contactList.add(contact);
}*//*
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}*/
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
int sizeofarray= Newslist.size();
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setAdapter(new CustomPagerAdapter(context,sizeofarray ));
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
TextView tvtitle=(TextView)findViewById(R.id.tvtitle);
TextView tvbody=(TextView)findViewById(R.id.tvbody);
ImageView im=(ImageView)findViewById(R.id.NewsImage);
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
for(position=0;position<20;position++) {
tvtitle.setText(Newslist.get(position).getTitle());
tvbody.setText(Newslist.get(position).getBody());
// Toast.makeText(getApplicationContext(),position//, Toast.LENGTH_LONG).show();
}
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
// im.setImageResource(String.format("https://www.amrita.edu/sites/default/files/%s", Newslist.get().getImage()));
Toast.makeText(getApplicationContext(),"sizeNewslist"+sizeofarray, Toast.LENGTH_LONG).show();
// Updating parsed JSON data into ListView
/*for(int i=1;i<3;i++){
Toast.makeText(getApplicationContext(),
"aaa"+newsLists,
Toast.LENGTH_LONG)
.show();
}*/
/* ListAdapter adapter = new SimpleAdapter(
MainActivity.this, newsList,
R.layout.list_item, new String[]{"name", "email",
"content"}, new int[]{R.id.image,
R.id.title, R.id.co});
lv.setAdapter(adapter);*/
}
}
}
/* public interface ClickListener {
void onClick(View view, int position);
void onLongClick(View view, int position);
}*/
adapter class
public class CustomPagerAdapter extends PagerAdapter {
String image_url;
private Context mContext;
int size;
ArrayList<News> Newslist;
File file,file1;
StringBuffer buffer,buffer1;
DataHandler handler;
public CustomPagerAdapter(Context context, int arraysize, ArrayList<News> newslist) {
mContext = context;
size=arraysize;
Newslist=newslist;
}
#Override
public Object instantiateItem(ViewGroup collection, int position) {
ModelObject modelObject = ModelObject.values()[position];
LayoutInflater inflater = LayoutInflater.from(mContext);
ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.row, collection, false);
collection.addView(layout);
TextView tvtitle=(TextView)layout.findViewById(R.id.tvtitle);
TextView tvbody=(TextView)layout.findViewById(R.id.tvbody);
ImageView im=(ImageView)layout.findViewById(R.id.NewsImage);
im.setScaleType(ImageView.ScaleType.FIT_XY);
SugarContext.init(mContext);
ConnectivityManager ConnectionManager=(ConnectivityManager)mContext.getSystemService(mContext.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo=ConnectionManager.getActiveNetworkInfo();
if(networkInfo != null && networkInfo.isConnected()==true )
{
tvtitle.setText(Html.fromHtml(Newslist.get(position).getTitle()));
tvbody.setText(Html.fromHtml(Newslist.get(position).getBody()));
image_url = "https://www.amrita.edu/sites/default/files/" + Newslist.get(position).getImage();
Picasso.with(mContext).load(image_url).into(im);
/*****************88*/
ArrayList<News> content = Newslist;
// String content="hello";
File file,file1;
FileOutputStream outputStream,outputStream1;
try {
//file = File.createTempFile("MyCache", null,getCacheDir());
file = new File(mContext.getCacheDir(), "newstitle");
file1 = new File(mContext.getCacheDir(), "newsbody");
outputStream = new FileOutputStream(file);
outputStream1 = new FileOutputStream(file1);
outputStream.write(content.get(position).getTitle().getBytes());
outputStream1.write(content.get(position).getBody().getBytes());
//outputStream.write(Integer.parseInt(content.get(position).getImage()));
// outputStream.write(Integer.parseInt(content.get(position).getTitle()));
// outputStream.write(Integer.parseInt(content.get(position).getBody()));
outputStream.close();
Log.d("filecreated", String.valueOf(file));
} catch (IOException e) {
e.printStackTrace();
}
BufferedReader input = null;
BufferedReader input1=null;
file = null;
file1=null;
try {
file = new File(mContext.getCacheDir(), "newstitle");
file1 = new File(mContext.getCacheDir(), "newsbody");// Pass getFilesDir() and "MyFile" to read file
input = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
input1 = new BufferedReader(new InputStreamReader(new FileInputStream(file1)));
String line,line1;
buffer = new StringBuffer();
buffer1 = new StringBuffer();
while ((line = input.readLine()) != null) {
buffer.append(line);
}
while ((line1 = input1.readLine()) != null) {
buffer1.append(line1);
}
String s=buffer.toString();
String t=buffer1.toString();
//Log.d("bufferdsample", buffer.toString());
Toast.makeText(mContext, "asas"+s, Toast.LENGTH_LONG).show();
Toast.makeText(mContext, "body"+t, Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
}
/*****************************88*/
/* try {
handler = new DataHandler(mContext);
handler.open();
} catch (Exception e) {
Toast.makeText(mContext, "exc " + e,
Toast.LENGTH_SHORT).show();
}
handler.insertData(Newslist.get(position).getImage(),Newslist.get(position).getTitle(),Newslist.get(position).getBody());
*/
Toast.makeText(mContext, "Network Available", Toast.LENGTH_LONG).show();
}
else
{
BufferedReader input = null;
BufferedReader input1=null;
file = null;
file1=null;
try {
file = new File(mContext.getCacheDir(), "newstitle");
file1 = new File(mContext.getCacheDir(), "newsbody");// Pass getFilesDir() and "MyFile" to read file
input = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
input1 = new BufferedReader(new InputStreamReader(new FileInputStream(file1)));
String line,line1;
buffer = new StringBuffer();
buffer1 = new StringBuffer();
while ((line = input.readLine()) != null) {
buffer.append(line);
}
while ((line1 = input1.readLine()) != null) {
buffer1.append(line1);
}
String s=buffer.toString();
String t=buffer1.toString();
//Log.d("bufferdsample", buffer.toString());
Toast.makeText(mContext, "asas"+s, Toast.LENGTH_LONG).show();
Toast.makeText(mContext, "body"+t, Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(mContext, "Network Available", Toast.LENGTH_LONG).show();
/* image_url = "https://www.amrita.edu/sites/default/files/" + Newslist.get(position).getImage();
Picasso.with(mContext).load(image_url).into(im);*/
}
/* String fileName="cachefile";
try {
cacheThis.writeObject(mContext, fileName, Newslist);
} catch (IOException e) {
e.printStackTrace();
}
try {
Newslist.addAll((List<News>) cacheThis.readObject(mContext, fileName));
Log.d("aaasasa", String.valueOf(Newslist));
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}*/
// ImageLoader class instance
// whenever you want to load an image from url
// call DisplayImage function
// url - image url to load
// loader - loader image, will be displayed before getting image
// image - ImageView
//im.setImageBitmap(getBitmapFromURL("https://3.bp.blogspot.com/-yEE6FqiglKw/VeBH_MmGGzI/AAAAAAAAbHE/HUYcYvkIwl0/s1600/AndroidImageViewSetImageFromURL2.png"));
// im.setImageResource(Uri.parse("https://www.amrita.edu/sites/default/files/%s", Newslist.get(position).getImage()));
// new DownloadImageTask(im).execute("https://www.amrita.edu/sites/default/files/" + Newslist.get(position).getImage());
return layout;
}
/*public void ofline(View view){
String filr_name="newfile";
FileOutputStream fileOutputStream = mContext.OpenfileOutput(filr_name,MODE_PRIVATE)
}
public void readmessage(View view){
}*/
#Override
public void destroyItem(ViewGroup collection, int position, Object view) {
collection.removeView((View) view);
}
#Override
public int getCount() {
return size;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
#Override
public CharSequence getPageTitle(int position) {
ModelObject customPagerEnum = ModelObject.values()[position];
return mContext.getString(customPagerEnum.getTitleResId());
}
}
When device is offline you can import /read from a File or database which contains this json value . After getting internet update the database or file .
For file you must make or move the file in
Environment.getExternalStorageDirectory();
And for writing in a file follow the code
private void writeToFile(String data,Context context) {
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput("test.txt", Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
And reading from external storage follow the following code
private String readFromFile(Context context) {
String ret = "";
try {
InputStream inputStream = context.openFileInput("test.txt");
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
}
inputStream.close();
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
return ret;
}
This is my code which I am using to verify, URL exists or not on Server, but always getting not exist however link is alive
Where I am doing mistake in my code, why I am always getting "doesnot exist !"
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String customURL = "http://www.desicomments.com/dc3/08/273858/273858.jpg";
boolean bResponse = exists(customURL);
if (bResponse==true)
{
Toast.makeText(MainActivity.this, "File exists!", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(MainActivity.this, "File does not exist!", Toast.LENGTH_SHORT).show();
}
}
public static boolean exists(String URLName){
try {
HttpURLConnection.setFollowRedirects(false);
HttpURLConnection con = (HttpURLConnection) new URL(URLName).openConnection();
con.setRequestMethod("HEAD");
return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
}
catch (Exception e) {
e.printStackTrace();
return false;
}
}
}
You will get Network On Main Thread Exception
Look at NetworkOnMainThreadException
so your method always returns false because of:
catch (Exception e) {
e.printStackTrace();
return false;
}
quick fix:
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String customURL = "http://www.desicomments.com/dc3/08/273858/273858.jpg";
MyTask task = new MyTask();
task.execute(customURL);
}
private class MyTask extends AsyncTask<String, Void, Boolean> {
#Override
protected void onPreExecute() {
}
#Override
protected Boolean doInBackground(String... params) {
try {
HttpURLConnection.setFollowRedirects(false);
HttpURLConnection con = (HttpURLConnection) new URL(params[0]).openConnection();
con.setRequestMethod("HEAD");
System.out.println(con.getResponseCode());
return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
}
catch (Exception e) {
e.printStackTrace();
return false;
}
}
#Override
protected void onPostExecute(Boolean result) {
boolean bResponse = result;
if (bResponse==true)
{
Toast.makeText(MainActivity.this, "File exists!", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(MainActivity.this, "File does not exist!", Toast.LENGTH_SHORT).show();
}
}
}
}
With a ScheduledThreadPoolExecutor:
but remember to shut down it!!
public class MainActivity extends Activity {
String customURL;
String msg = "";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customURL = "http://www.desicomments.com/dc3/08/273858/273858.jpg";
final ScheduledThreadPoolExecutor myTimer = new ScheduledThreadPoolExecutor(1);
myTimer.scheduleAtFixedRate(new Runnable() {
#Override
public void run() {
try {
HttpURLConnection.setFollowRedirects(false);
HttpURLConnection con = (HttpURLConnection) new URL(customURL).openConnection();
con.setRequestMethod("HEAD");
System.out.println(con.getResponseCode());
if(con.getResponseCode() == HttpURLConnection.HTTP_OK){
msg = "File exist!";
}else{
msg = "File does not exist!";
}
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
}
});
}
catch (Exception e) {
e.printStackTrace();
return;
}
}
}, 0,10000, TimeUnit.MILLISECONDS);
}
Change your exists() to this
public boolean exists(String url){
HttpURLConnection huc = ( HttpURLConnection ) url.openConnection ();
huc.setRequestMethod ("GET"); //OR huc.setRequestMethod ("HEAD");
huc.connect () ;
int code = huc.getResponseCode() ;
System.out.println(code);
if(code==200)
return true;
else
return false;
}
Use if(bResponse) instead of if(bResponse==true)
you can use the follow code to try.
final String customURL = "http://www.desicomments.com/dc3/08/273858/273858.jpg";
new Thread(){
#Override
public void run() {
// TODO Auto-generated method stub
super.run();
try {
URL url = new URL(customURL);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("HEAD");
con.connect();
Log.i(TAG, "con.getResponseCode() IS : " + con.getResponseCode());
if(con.getResponseCode() == HttpURLConnection.HTTP_OK){
Log.i(TAG, "Sucess");
}
} catch (Exception e) {
e.printStackTrace();
Log.i(TAG, "fail");
}
}
}.start();
Reason: After android 2.3, you can't perform a networking operation on its main thread,
if you do so, there will be can exception and you can't get the right result.
So if you want the application to perform a networking operation, you can use another Thread to do it.
I use this code to verify url alive. I have tested this code with image url
Example:
url = "https://ima.vn/wp-content/uploads/2017/11/ima-sofa-titan-trungkinh-1-of-3.jpg"
message = "Image url";
public void assertUrlalive(String url, String message) {
try {
URL myUrl = new URL(url);
HttpURLConnection huc = (HttpURLConnection) myUrl.openConnection();
assertEquals(huc.getResponseCode(), 200, message);
} catch (IOException e) {
e.printStackTrace();
logger.error("Connection Err: " + e.getMessage());
}
}